local GroupBrowser = {}GroupBrowser.__index = GroupBrowserlocal GroupBrowserInstance = nilfunction Tubes.GroupBrowser ()	if not GroupBrowserInstance then		GroupBrowserInstance = {}		setmetatable (GroupBrowserInstance, GroupBrowser)		GroupBrowserInstance:ctor ()				Tubes:AddEventListener ("Unload", function ()			GroupBrowserInstance:dtor ()			GroupBrowserInstance = nil		end)	end	return GroupBrowserInstanceendfunction GroupBrowser:ctor ()	self.Panel = vgui.Create ("TubesGroupBrowserFrame")endfunction GroupBrowser:dtor ()	self.Panel:Remove ()endfunction GroupBrowser:GetFrame ()	return self.Panelendconcommand.Add ("tubes_show_groupbrowser", function ()	Tubes.GroupBrowser ():GetFrame ():SetVisible (true)end)